Improvement #1. Revisions are on by default

This is a small, but useful change. All content types now have revisions enabled by default:

Improvement #2. The Place Blocks module

This is an experimental module that you'll need to enable. The module is designed to add a visual page builder element to Drupal.

Enable the "Place block" module.

You'll see a "Place block" link to the admin toolbar:

Click the link and you'll see the theme layout with a "Place block" button in each region:

Click the button, and you'll get a choice of blocks to add:

Improvement #3. Link to items after saving

Whenever you save an item in Drupal 8, you'll now see a direct link to the item:

Improvement #4. Contact forms have a redirect link

With modules like Webform still waiting for a Drupal 8 release, the focus is improving the default contact forms.

In Drupal 8.2, you can now redirect users to a thank you page, after they submit a form:

Improvement #5. View modes for your comments

This is a feature that was left half-finished in earlier version of Drupal 8. It was possible to create view modes for your comments, but they were very hard to use. With Drupal 8.2, you can choose a view mode from inside the "Manage Display" for your content types. Here's how it works:

Go to Structure > Display modes > View modes.

Structure > Comment types > Manage display.

Click "Custom Display Settings".

You can now choose the view mode you just created, as in the image below:

Click "Save".

You can now re-arrange the fields for this view mode.

Click "Save" when you have arranged the fields.

Go to Structure > Content types > Manage display.

You can now choose a view mode for your comments.

Improvement #6. CKEditor looks more like Drupal

If you use CKEditor's inline editing, the pop-ups will now look much more like Drupal than CKEditor.